Sharp PC-1500 : "Rase-mottes" game

A very simple game : you pilot a small plane that crosses the
screen from left to right, and you must fly as close to the
ground as possible (without crashing). And don't miss the exit at
the right !

Start the program with DEF S or RUN.
Press any key to start the game. The plane goes from left to
right automatically.
"8" : move up
"." : move down
After the game is over, press "ON/Break"
to exit the program, or any key to replay.